From f84beee9b8a0edddb9b63eba5ca7acb8c2373636 Mon Sep 17 00:00:00 2001 From: QingShan Zhang Date: Mon, 16 Mar 2020 01:58:49 +0000 Subject: [NFC][Test] Add three tests to verify the behavior of a*b-c*d if there is multi-uses --- llvm/test/CodeGen/PowerPC/fma-precision.ll | 67 ++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/llvm/test/CodeGen/PowerPC/fma-precision.ll b/llvm/test/CodeGen/PowerPC/fma-precision.ll index 24c304d26e5f..7f832d8bf4ff 100644 --- a/llvm/test/CodeGen/PowerPC/fma-precision.ll +++ b/llvm/test/CodeGen/PowerPC/fma-precision.ll @@ -97,3 +97,70 @@ entry: %add = fadd fast double %mul1, %mul ret double %add } + +define double @fma_multi_uses1(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) { +; CHECK-LABEL: fma_multi_uses1: +; CHECK: # %bb.0: +; CHECK-NEXT: xsmuldp 5, 1, 2 +; CHECK-NEXT: xsmuldp 0, 3, 4 +; CHECK-NEXT: stfd 5, 0(7) +; CHECK-NEXT: stfd 5, 0(8) +; CHECK-NEXT: stfd 0, 0(9) +; CHECK-NEXT: xsmsubadp 0, 1, 2 +; CHECK-NEXT: fmr 1, 0 +; CHECK-NEXT: blr + %ab = fmul fast double %a, %b + %cd = fmul fast double %c, %d + store double %ab, double* %p1 ; extra use of %ab + store double %ab, double* %p2 ; another extra use of %ab + store double %cd, double* %p3 ; extra use of %cd + %r = fsub fast double %ab, %cd + ret double %r +} + +define double @fma_multi_uses2(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) { +; CHECK-LABEL: fma_multi_uses2: +; CHECK: # %bb.0: +; CHECK-NEXT: xsmuldp 5, 1, 2 +; CHECK-NEXT: xsmuldp 0, 3, 4 +; CHECK-NEXT: stfd 5, 0(7) +; CHECK-NEXT: stfd 0, 0(8) +; CHECK-NEXT: stfd 0, 0(9) +; CHECK-NEXT: xsmsubadp 0, 1, 2 +; CHECK-NEXT: fmr 1, 0 +; CHECK-NEXT: blr + %ab = fmul fast double %a, %b + %cd = fmul fast double %c, %d + store double %ab, double* %p1 ; extra use of %ab + store double %cd, double* %p2 ; extra use of %cd + store double %cd, double* %p3 ; another extra use of %cd + %r = fsub fast double %ab, %cd + ret double %r +} + +define double @fma_multi_uses3(double %a, double %b, double %c, double %d, double %f, double %g, double* %p1, double* %p2, double* %p3) { +; CHECK-LABEL: fma_multi_uses3: +; CHECK: # %bb.0: +; CHECK-NEXT: xsmuldp 0, 1, 2 +; CHECK-NEXT: xsmuldp 3, 3, 4 +; CHECK-NEXT: ld 3, 96(1) +; CHECK-NEXT: stfd 0, 0(9) +; CHECK-NEXT: stfd 0, 0(10) +; CHECK-NEXT: fmr 0, 3 +; CHECK-NEXT: xsmsubadp 3, 1, 2 +; CHECK-NEXT: xsmsubadp 0, 5, 6 +; CHECK-NEXT: xsmuldp 4, 5, 6 +; CHECK-NEXT: stfd 4, 0(3) +; CHECK-NEXT: xsadddp 1, 3, 0 +; CHECK-NEXT: blr + %ab = fmul fast double %a, %b + %cd = fmul fast double %c, %d + %fg = fmul fast double %f, %g + store double %ab, double* %p1 ; extra use of %ab + store double %ab, double* %p2 ; another extra use of %ab + store double %fg, double* %p3 ; extra use of %fg + %q = fsub fast double %fg, %cd ; The uses of %cd reduce to 1 after %r is folded. 2 uses of %fg, fold %cd, remove def of %cd + %r = fsub fast double %ab, %cd ; Fold %r before %q. 3 uses of %ab, 2 uses of %cd, fold %cd + %add = fadd fast double %r, %q + ret double %add +} -- cgit v1.2.3